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virtio-blk: Use blk_drain() to drain IO requests

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Each call of the virtio_blk_reset() function calls blk_drain_all(),
which works for all existing BlockDriverStates, while draining only
one is needed.

This patch replaces blk_drain_all() by blk_drain() in
virtio_blk_reset(). virtio_blk_data_plane_stop() should be called
after draining because it restores vblk->complete_request.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Message-id: 1434537440-28236-3-git-send-email-yarygin@linux.vnet.ibm.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alexander Yarygin 2015-06-17 13:37:20 +03:00 committed by Stefan Hajnoczi
parent 97b0385a34
commit 6e40b3bfc7
1 changed files with 10 additions and 5 deletions
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15
hw/block/virtio-blk.c
View File

@ -651,16 +651,21 @@ static void virtio_blk_dma_restart_cb(void *opaque, int running,
static void virtio_blk_reset(VirtIODevice *vdev)
{
VirtIOBlock *s = VIRTIO_BLK(vdev);
if (s->dataplane) {
virtio_blk_data_plane_stop(s->dataplane);
}
AioContext *ctx;
/*
* This should cancel pending requests, but can't do nicely until there
* are per-device request lists.
*/
blk_drain_all();
ctx = blk_get_aio_context(s->blk);
aio_context_acquire(ctx);
blk_drain(s->blk);
if (s->dataplane) {
virtio_blk_data_plane_stop(s->dataplane);
}
aio_context_release(ctx);
blk_set_enable_write_cache(s->blk, s->original_wce);
}